On a more serious note, depending what you want this for, you could probably take just about any song by Two Steps From Hell. While not about water necessarily, the epicness of them means they don't really have to be. Unless you just want ambient background noise. Blizzard specifically seems to sound underwatery in my opinion.

"You want to believe that there’s one relationship in life that’s beyond betrayal. A relationship that’s beyond that kind of hurt. And there isn’t." -Caleb Carr

Well, music is one of my strong points, and I especially like the first 5 seconds of this. (I'll search for more, but this is what I've found so far)https://www.youtube.com/watch?v=pX_jySkFIK4What I don't like about the rest of it is that it never dims, especially the high 'flute' sounding instrument, which sort of ruins the atmosphere.Anyway, I think the first few seconds would be great to build upon. Make crescs. and dims. and add more bass notes. For those who are looking for a more 'peaceful' background sort of music....

Whenever I open up Subterfuge, this song starts playing in my head. One of the greatest songs in all video game history: Brinstar Depths, originally from Super Metroid.https://m.youtube.com/watch?v=kbWgt5fHvKA

Or, at least, the first half. The second half is great too, but it's not the right ambience.

"Can I make a suggestion that doesn't involve violence, or is this the wrong crowd for that?" -Hoban 'Wash' Washburn, Serenity